Service Hybrid System keeps popping up after driving for a bit on 2008 Chevrolet Tahoe Hybrid

The Service Hybrid system keeps popping up and when i make a complete stop i have to turn off the car and crank it back up to get it started but it'll keep doing that till eventually the car will just stop while driving and you can't turn it back on i've taken it in to get repaired but it always comes back.